2014年职称英语综合类的练习题之阅读理解8
<p> <span word="Lead">Lead</span> <span word="Pollution">Pollution</span></p><p> <span word="Lead">Lead</span> <span word="deposits">deposits</span>, <span word="which">which</span> <span word="accumulated">accumulated</span> <span word="in">in</span> <span word="soil">soil</span> <span word="and">and</span> <span word="snow">snow</span> <span word="during">during</span> <span word="the">the</span> 1960<span word="s">s</span> <span word="and">and</span> 70<span word="s">s</span>, <span word="were">were</span> <span word="primarily">primarily</span> <span word="the">the</span> <span word="result">result</span> <span word="of">of</span> <span word="leaded">leaded</span> <span word="gasoline">gasoline</span> <span word="emissions">emissions</span> <span word="originating">originating</span> <span word="in">in</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span>. <span word="In">In</span> <span word="the">the</span> <span word="twenty">twenty</span> <span word="years">years</span> <span word="that">that</span> <span word="the">the</span> <span word="Clean">Clean</span> <span word="Air">Air</span> <span word="Act">Act</span> <span word="has">has</span> <span word="mandated">mandated</span> <span word="unleaded">unleaded</span> <span word="gas">gas</span> <span word="use">use</span> <span word="in">in</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span>, <span word="the">the</span> <span word="lead">lead</span> <span word="accumulation">accumulation</span> <span word="worldwide">worldwide</span> <span word="has">has</span> <span word="decreased">decreased</span> <span word="significantly">significantly</span>.</p><p> <span word="A">A</span> <span word="study">study</span> <span word="published">published</span> <span word="recently">recently</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Nature">Nature</span> <span word="shows">shows</span> <span word="that">that</span> <span word="air">air</span>-<span word="borne">borne</span> <span word="leaded">leaded</span> <span word="gas">gas</span> <span word="emissions">emissions</span> <span word="from">from</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span> <span word="were">were</span> <span word="the">the</span> <span word="leading">leading</span> <span word="contributor">contributor</span> <span word="to">to</span> <span word="the">the</span> <span word="high">high</span> <span word="concentration">concentration</span> <span word="of">of</span> <span word="lead">lead</span> <span word="in">in</span> <span word="the">the</span> <span word="snow">snow</span> <span word="in">in</span> <span word="Greenland">Greenland</span>. <span word="The">The</span> <span word="new">new</span> <span word="study">study</span> <span word="is">is</span> <span word="a">a</span> <span word="result">result</span> <span word="of">of</span> <span word="the">the</span> <span word="continued">continued</span> <span word="research">research</span> <span word="led">led</span> <span word="by">by</span> <span word="Dr">Dr</span>. <span word="Charles">Charles</span> <span word="Boutron">Boutron</span>, <span word="an">an</span> <span word="expert">expert</span> <span word="on">on</span> <span word="the">the</span> <span word="impact">impact</span> <span word="of">of</span> <span word="heavy">heavy</span> <span word="metals">metals</span> <span word="on">on</span> <span word="the">the</span> <span word="environment">environment</span> <span word="at">at</span> <span word="the">the</span> <span word="National">National</span> <span word="Center">Center</span> <span word="for">for</span> <span word="Scientific">Scientific</span> <span word="Research">Research</span> <span word="in">in</span> <span word="France">France</span>. <span word="A">A</span> <span word="study">study</span> <span word="by">by</span> <span word="Dr">Dr</span>. <span word="Boutron">Boutron</span> <span word="published">published</span> <span word="in">in</span> 1991 <span word="showed">showed</span> <span word="that">that</span> <span word="lead">lead</span> <span word="levels">levels</span> <span word="in">in</span> <span word="arctic">arctic</span> <span word="snow">snow</span> <span word="were">were</span> <span word="declining">declining</span>.</p><p> <span word="In">In</span> <span word="his">his</span> <span word="new">new</span> <span word="study">study</span>, <span word="Dr">Dr</span>. <span word="Boutron">Boutron</span> <span word="found">found</span> <span word="the">the</span> <span word="ratios">ratios</span> <span word="of">of</span> <span word="the">the</span> <span word="different">different</span> <span word="forms">forms</span> <span word="of">of</span> <span word="lead">lead</span> <span word="in">in</span> <span word="the">the</span> <span word="leaded">leaded</span> <span word="gasoline">gasoline</span> <span word="used">used</span> <span word="in">in</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span> <span word="were">were</span> <span word="different">different</span> <span word="from">from</span> <span word="the">the</span> <span word="ratios">ratios</span> <span word="of">of</span> <span word="European">European</span>, <span word="Asian">Asian</span> <span word="and">and</span> <span word="Canadian">Canadian</span> <span word="gasolines">gasolines</span> <span word="and">and</span> <span word="thus">thus</span> <span word="enabled">enabled</span> <span word="scientists">scientists</span> <span word="to">to</span> <span word="differentiate">differentiate</span> <span word="the">the</span> <span word="lead">lead</span> <span word="sources">sources</span>. <span word="The">The</span> <span word="dominant">dominant</span> <span word="lead">lead</span> <span word="ratio">ratio</span> <span word="found">found</span> <span word="in">in</span> <span word="Greenland">Greenland</span> <span word="snow">snow</span> <span word="matched">matched</span> <span word="that">that</span> <span word="found">found</span> <span word="in">in</span> <span word="gasoline">gasoline</span> <span word="from">from</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span>.</p><p> <span word="In">In</span> <span word="a">a</span> <span word="study">study</span> <span word="published">published</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Ambio">Ambio</span>, <span word="scientists">scientists</span> <span word="found">found</span> <span word="that">that</span> <span word="lead">lead</span> <span word="levels">levels</span> <span word="in">in</span> <span word="soil">soil</span> <span word="in">in</span> <span word="the">the</span> <span word="Northeastern">Northeastern</span> <span word="United">United</span> <span word="States">States</span> <span word="had">had</span> <span word="decreased">decreased</span> <span word="markedly">markedly</span> <span word="since">since</span> <span word="the">the</span> <span word="introduction">introduction</span> <span word="of">of</span> <span word="unleaded">unleaded</span> <span word="gasoline">gasoline</span>.</p><p> <span word="Many">Many</span> <span word="scientists">scientists</span> <span word="had">had</span> <span word="believed">believed</span> <span word="that">that</span> <span word="the">the</span> <span word="lead">lead</span> <span word="would">would</span> <span word="stay">stay</span> <span word="in">in</span> <span word="soil">soil</span> <span word="and">and</span> <span word="snow">snow</span> <span word="for">for</span> <span word="a">a</span> <span word="longer">longer</span> <span word="period">period</span>.</p>
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